ASSESSMENT OF THE EFFECT OF GEOGRID POSITION IN THE UNDERLAYER OF FLEXIBLE PAVEMENT
Volume Title: ICASGE2025
Paper ID : 1046-ICASGE-FULL (R1)
Authors
1Transportation Engineering Department, Faculty of Engineering, Alexandria University El-Horreya Ave., Alexandria 21544, Egypt
2El-Horreya Ave., Alexandria, 21544 Egypt
Abstract
Construct roads over weak subgrade is a common challenge that engineers and construction companies face, especially around the Delta region of Egypt. Usually, they made a soil replacement or increase embankment thickness. However, using geosynthetic materials is the most effective strategy to reduce this cost.
Geosynthetic materials are commonly utilized to improve engineering practice in buildings, bridges, and asphalt concrete pavement. Geogrid, a popular stabilization product, can be used to reinforce pavement by providing an additional tensile element in addition to help distribute load and reduce subgrade distortion.
This paper performed the application of the finite element analysis using Plaxis 2D software on reinforced asphalt pavement where a numerical analysis was carried out to investigate the effect of geogrid on the critical asphalt pavement responses such as vertical surface displacement and base layer thickness. Three modeling phases were conducted. first, unreinforced pavement modeling. Second modeling was to determine the optimum geogrid location inside underlayers of flexible pavement. The last sequence was to investigate the effectiveness of one-layer geogrid-reinforced flexible pavement in terms of reduction of base layer thickness. The results showed a reduction in vertical surface deformation when the geogrid was added inside underlayers of flexible pavement and it also showed a moderate improvement in base and subbase layer thickness reduction after using the geogrid. In addition, by using the same geogrid position, the displacement difference between base layers with thicknesses of 0.4 and 0.3 was only about 2.54% decrease with the same subbase layer thickness of 2m.
Geosynthetic materials are commonly utilized to improve engineering practice in buildings, bridges, and asphalt concrete pavement. Geogrid, a popular stabilization product, can be used to reinforce pavement by providing an additional tensile element in addition to help distribute load and reduce subgrade distortion.
This paper performed the application of the finite element analysis using Plaxis 2D software on reinforced asphalt pavement where a numerical analysis was carried out to investigate the effect of geogrid on the critical asphalt pavement responses such as vertical surface displacement and base layer thickness. Three modeling phases were conducted. first, unreinforced pavement modeling. Second modeling was to determine the optimum geogrid location inside underlayers of flexible pavement. The last sequence was to investigate the effectiveness of one-layer geogrid-reinforced flexible pavement in terms of reduction of base layer thickness. The results showed a reduction in vertical surface deformation when the geogrid was added inside underlayers of flexible pavement and it also showed a moderate improvement in base and subbase layer thickness reduction after using the geogrid. In addition, by using the same geogrid position, the displacement difference between base layers with thicknesses of 0.4 and 0.3 was only about 2.54% decrease with the same subbase layer thickness of 2m.
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